Spotify to offer free streaming service for Android and iOS

Spotify has announced that it's going to extend its free ad-supported music streaming service to Android and iOS devices.

Up until now, only desktop users have been able to stream music, with ads, for free, while Spotify premium members could also stream music and save them for offline playback on their mobile devices.

Spotify hopes that extended free streaming to non-paying mobile device users will tempt them into springing for a premium membership where they can take advantage of higher-quality streaming, no ads and the ability to listen to music offline.

It's also extending its service to to another 20 countries and will be adding Led Zeppelin's tracks to its already packed library.